My wife and I stayed in a Premium King River View room for our 3-night stay in San Sebastian. The check-in process was quick (we arrived at 2:00 pm) and we were escorted to our room and given a brief overview of the room's features. This was our first stop on our 5-year anniversary trip and I did mention that when I made the reservation. A bottle of Reina Ma Cristina Reserva Brut Blanc De Noirs 2015 was waiting for us in our room, along with a card and some fruit, which was a nice touch!
The room itself was perfect, with lots of natural light, great views, high ceilings and a comfortable bed. Everything was clean and seemed fairly new or recently renovated. Classic and sophisticated with some modern touches mixed in. We didn't use the bathtub but the shower had excellent water pressure. Everyone went above and beyond to make sure we had an excellent stay, including the bell staff, front desk, concierge, bar and restaurant staff. This was our first time in Spain and everyone was happy to help. The Pinxto Tour that's run by the MIMO cooking school in the basement of the hotel is well worth it as well, especially if you've never been to San Sebastian. The location of the hotel is great too, as it's a short 5 minute walk to old town and also close to shopping. The city itself is very walkable.